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Author Topic:   performance advantages
RangeRover
Member
posted February 22, 2001 09:09 PM
How much do you think your tech man will let pass? Also need more info on your engine and carb rules. cubic inch limit? Are limited to any hydralic cam or is it also a lift rule? Dome or flat top pistons? Deck clearance? What type of heads and intakes are you allowed?


RangeRover
Member
posted February 27, 2001 09:01 PM
I hate to say it, but money buys speed. Seems the best head to run now is the vortec heads.Try to get engine rotating weight down as light as you can afford.Get your compression ratio up as high as possible.These heads and a zero deck height with flat top pistons will get you around 11.5. Is your cam lift measured at the valve or the cam lobe? I would talk with some of the cam company,s about a cam and talk to some professional carb builders about the carb. I have seen some people using the aluminum TBI intakes. If allowed, port match your intake and heads. I have even ran the deck height .005 out of the hole. This will add a little more compression. If allowed, I also like 6 inch rods.


awkwardjeff
Member
posted February 28, 2001 08:33 AM
I would just like to say, that you should NEVER put the piston out of the bore.....
what you can in compression you loose in flame travel and ring seal........the pistons should be around .002-.006 down the bore.....ask any piston builder, Ross want their's .008 down the bore.
But go ahead and run the thin head gasket to get compression up. angle mill the heads does two things, First is to make the combustion chamber smaller the 2nd thing is it moves the valve away from the cylinder wall, unshrouding the valve face.
Also on the head take a die-grinder and open up the chamber at the intake valve closest to the wall. this will help let the air go around the whole valve not just part of the valve...........
My only point was not to let the piston out the bore. You can accomplish the same thing with better results by using a thin head gasket.......Jeff


RangeRover
Member
posted February 28, 2001 09:10 PM
Most pistons will be within the range of the rings in the bore with the piston .005 out of the deck. A flat top pistons promotes the best flame travel, so I feel that the .005 out of the deck will not hurt. I ran this with no problems. Angle milling the heads takes more material off the exhaust side of the head than the intake side, giving you a smaller combustion chamber than just a flat milling of the head. Depends on how good of a tech man you have if he can detect this. I would say most likely not without cc.ing the heads. The smaller you can make the combustion chamber the better.


chomme
Member
posted March 01, 2001 09:51 PM
nobody has thought the gear are you running anything different than everybody else? another thing you might want to consider is changing rocker arm ratios. we run the same type engine rule and what we have forund works best is a cam dynamics cam and changing the rockers. if you would like email me and i'll give you the #'s on that maybe it will help racer17j@hotmail.com

[This message has been edited by racer17j (edited March 08, 2001).]

RangeRover
Member
posted March 08, 2001 09:36 PM
Sorry if this is difficult to read, but this is my first note on the bulletin board. I am replying to your question about using a cross-over pipe on your exhaust. A balance tube will act in the same way as increasing the collector length on open headers. What this does is increase your low-end torque, but it does not sacrifice top-end HP. You don't even have to make an "X", an "H" will work just as well, and you won't have to rebuild your entire exhaust.I've seen these balance pipes worth as much as 15 lb/ft of torque from idle to about 3500. It's cheap power and I highly recommend trying it.


chomme
Member
posted March 12, 2001 07:46 PM
Where do we start here? hmmmmmmmm acid porting? trick fuel? trick heads? It all depends how bad you want to win. I've heard bomber cars sound like latemodels before. Like the old saying goes "Show me a winner and I'll show you a cheater!" If your within the rules and they're running away from ya, their doin sumthin your not. 383 kits are cheap and fit in a 350 block, hmmmmmmmmmm.